1、 IEC 60534-8-3 Edition 3.0 2010-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-process control valves Part 8-3: Noise considerations Control valve aerodynamic noise prediction method Vannes de rgulation des processus industriels Partie 8-3: Considrations sur le bruit Mthode de prdiction d
2、u bruit arodynamique des vannes de rgulation IEC 60534-8-3:2010 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechan
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16、on ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60534-8-3 Edition 3.0 2010-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-process control valves Part 8-3: Noise considerations Control v
17、alve aerodynamic noise prediction method Vannes de rgulation des processus industriels Partie 8-3: Considrations sur le bruit Mthode de prdiction du bruit arodynamique des vannes de rgulation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE X ICS 17.140.20; 23.060
18、.40; 25.040.40 PRICE CODE CODE PRIX ISBN 978-2-88912-241-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60534-8-3 IEC:2010 CONTENTS FOREWORD . 4 INTRODUCTION 6 1 Scope . 7 2 Normative references . 7 3 Terms and
19、definitions . 8 4 Symbols 9 5 Valves with standard trim . 12 5.1 Pressures and pressure ratios. 12 5.2 Regime definition 13 5.3 Preliminary calculations . 14 5.3.1 Valve style modifier F d14 5.3.2 Jet diameter D j. 14 5.3.3 Inlet fluid density r 114 5.4 Internal noise calculations 15 5.4.1 Calculati
20、ons common to all regimes . 15 5.4.2 Regime dependent calculations . 16 5.4.3 Downstream calculations . 18 5.4.4 Valve internal sound pressure calculation at pipe wall . 19 5.5 Pipe transmission loss calculation. 20 5.6 External sound pressure calculation 21 5.7 Calculation flow chart 22 6 Valves wi
21、th special trim design . 22 6.1 General 22 6.2 Single stage, multiple flow passage trim 22 6.3 Single flow path, multistage pressure reduction trim (two or more throttling steps) . 23 6.4 Multipath, multistage trim (two or more passages and two or more stages) 25 7 Valves with higher outlet Mach num
22、bers 27 7.1 General 27 7.2 Calculation procedure 27 8 Valves with experimentally determined acoustical efficiency factors 28 9 Combination of noise produced by a control valve with downstream installed two or more fixed area stages . 29 Annex A (informative) Calculation examples . 31 Bibliography 46
23、 Figure 1 Single stage, multiple flow passage trim 23 Figure 2 Single flow path, multistage pressure reduction trim . 24 Figure 3 Multipath, multistage trim (two or more passages and two or more stages) . 26 Figure 4 Control valve with downstream installed two fixed area stages 30 Table 1 Numerical
24、constants N . 15 Table 2 Typical values of valve style modifier F d(full size trim) . 15 Table 3 Overview of regime dependent equations . 17 60534-8-3 IEC:2010 3 Table 4 Typical values of A hand St p18 Table 5 Indexed frequency bands . 19 Table 6 Frequency factors G x (f) and G y (f) 21 Table 7 “A”
25、weighting factor at frequency f i. 22 4 60534-8-3 IEC:2010 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ INDUSTRIAL-PROCESS CONTROL VALVES Part 8-3: Noise considerations Control valve aerodynamic noise prediction method FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide org
26、anization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities
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33、ble for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical commit
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35、s. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
36、 rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60534-8-3 has been prepared by subcommittee 65B: Measurements and control devices, of IEC technical committee 65: Industrial-process measurement, control and automation. This third ed
37、ition cancels and replaces the second edition published in 2000. This edition constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows: predicting noise as a function of frequency; using laboratory data to determine the acoustical effici
38、ency factor. 60534-8-3 IEC:2010 5 The text of this standard is based on the following documents: FDIS Report on voting 65B/765/FDIS 65B/780/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has bee
39、n drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts of the IEC 60534 series, under the general title Industrial-process control valves can be found on the IEC website The committee has decided that the contents of this publication will remain unchanged until the stab
40、ility date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 60534-8-3 IEC:2010 INTRODUCTION The mechanical stream power as well as ac
41、oustical efficiency factors are calculated for various flow regimes. These acoustical efficiency factors give the proportion of the mechanical stream power which is converted into internal sound power. This method also provides for the calculation of the internal sound pressure and the peak frequenc
42、y for this sound pressure, which is of special importance in the calculation of the pipe transmission loss. At present, a common requirement by valve users is the knowledge of the sound pressure level outside the pipe, typically 1 m downstream of the valve or expander and 1 m from the pipe wall. Thi
43、s standard offers a method to establish this value. The equations in this standard make use of the valve sizing factors as used in IEC 60534-1 and IEC 60534-2-1. In the usual control valve, little noise travels through the wall of the valve. The noise of interest is only that which travels downstrea
44、m of the valve and inside of the pipe and then escapes through the wall of the pipe to be measured typically at 1 m downstream of the valve body and 1 m away from the outer pipe wall. Secondary noise sources may be created where the gas exits the valve outlet at higher Mach numbers. This method allo
45、ws for the estimation of these additional sound levels which can then be added logarithmically to the sound levels created within the valve. Although this prediction method cannot guarantee actual results in the field, it yields calculated predictions within 5 dB(A) for the majority of noise data fr
46、om tests under laboratory conditions (see IEC 60534-8-1). The current edition has increased the level of confidence of the calculation. In some cases the results of the previous editions were more conservative. The bulk of the test data used to validate the method was generated using air at moderate
47、 pressures and temperatures. However, it is believed that the method is generally applicable to other gases and vapours and at higher pressures. Uncertainties become greater as the fluid behaves less perfectly for extreme temperatures and for downstream pressures far different from atmospheric, or n
48、ear the critical point. The equations include terms which account for fluid density and the ratio of specific heat. NOTE Laboratory air tests conducted with up to 1 830 kPa (18,3 bar) upstream pressure and up to 1 600 kPa (16,0 bar) downstream pressure and steam tests up to 225 C showed good agreeme
49、nt with the calculated values. A rigorous analysis of the transmission loss equations is beyond the scope of this standard. The method considers the interaction between the sound waves existing in the pipe fluid and the first coincidence frequency in the pipe wall. In addition, the wide tolerances in pipe wall thickness allowed in commercial pipe severely limit the value of the very complicated ma
